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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79534805119268eae48ef6650fb261ae0cee7b71830b452c0fdfc8bc4f345d11' 
  AND token = 'S7Mddq4OOyuY4fjiEyHF5JQVtFosEq5aSzJGSm9XOJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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