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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd91302dabaf3451ff164cd3237a2d85c724d32c4222bd1f71f6d89f8051ee7e' 
  AND token = 'xwUAQoomZcJ8rEpb8rtMl/+8qW1IL6xf1fcy00SbLTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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