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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e812d8e8246fb47b775b7cd7f40717fb1c895afcd55c98a60a47eac5c2c70fa4' 
  AND token = 'XCHg9DVU8S4MSTYae3onK96M9RbBwTACnz9fExgrFr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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