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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082f267d40fb772cf796d98f811147adefb637df7f3b1921aaea1e8ed074f5e9' 
  AND token = '2M7b4B5ZJ/ZEM+AzcGe51aMmLb8AaLhwktKR+KdfxPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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