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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1fe18cd3b688ba74afa400459ca1069dfdb3336351a1fa6d233fa09a2a49744' 
  AND token = 'N2Ngdb5W0FK58G8sisNYVSyn74kTYcFnLxyI1U/jH24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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