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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0b47667b19a1f99e8ab212bf0138186756989b3d7ce5fcefa878de7d141e29' 
  AND token = '8Xg/LhmtYs861enc85X/R58xu+jQ6J2yhKihODHRSnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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