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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36c22232b98b2f58b7d86b26aa9671217fc9b21bac8ca54c30d461a8e9f5fb0' 
  AND token = 'r0QhwG4Qkc3ScYT3KMslFrXzgVjH3gAo1IiT1GtUef8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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