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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c2fba815ad5f77a52f241be156abe4f123fcb3af283910fd9918c9ccdb7d50' 
  AND token = 'bBwLEd9NVFlURT5xlEaBkC2H4hXuOpiKytf/u28cXZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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