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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6e64c07a1e4f9fae34bb5c71681eab5d14bd7302e50ec71a985f9f6474750a' 
  AND token = 'UHv6PRzxjVMYdj5YsAnf6hk/bFbW00ooA6Omnc5/uk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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