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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b170d99b148013c58cc8f820453e35c51abbbca3b27a9e4a1453408e79d4b4e3' 
  AND token = 'mna0f+0jaeZwTid7wZntOqDO1LgCrzy42ZQoIO8zDLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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