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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f1551793a00a756f606fc12b2598b7246d9df388e9ac3f4f0a0d90e95c8287' 
  AND token = 'wTc0DVip0uoxUpQfRftXL1hm+kWCPbBRKx5RHxU2GqI=' 
  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"
    }
  }
}