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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa8a81d0226bc9c4e748560defeef43fddd1bba4cfdb47a98ad79f0746286e1' 
  AND token = 'BcOi5wkVbTMJIjaHkFIln6Z9tADIUHIdbM0G2ZmDxTg=' 
  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"
    }
  }
}