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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b955c41920b4342bd78c8a6db9c6bb86e48f8446c44daa3e056231d6631d49c' 
  AND token = 'MBY6+SLUA+/pcZbCORgmU3nLUa1FtkzoUCyjJyMRE4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}