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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef81e0006dbb1544bc603fb43c826a02c8218a37be9fe8757db9985455943bab' 
  AND token = 'S5TdxspE57b8xqhL1binwXJ5x2l2Jdfy4sdslwun1Q0=' 
  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"
    }
  }
}