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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413861ce5d38967dc3db68c25ffd846fd7abf263e1d8fe7af1a257a0fba9c8bf' 
  AND token = '8izEQ/zQZsq4jLcycj1f+xZfsB+xy7nr0qzopjhzrCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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