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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8483e07ee6d8bd82d57e7844fac71cb135a26ad10f24bffed475182150b75d' 
  AND token = '+N2+zaRgj1tNlznr71dFc0gmwgV5xTzgKWNPjGQ7Ygc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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