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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceac9d2aa1a8e7b2361921828963465599d6aa1f30683f1e6a500fd0b78ac8e5' 
  AND token = '25sEejkcAqpqhJ59OggczcTg271pglqTSHiHxt8IWa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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