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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8c5189d5231e29b0a9a10924fb4599c1ffc038234dc89060a7ba25b20e3ed9' 
  AND token = 'Uts5vDmU+O0vRLn8EV7OqhvxjZV6n2gKMkS8r3Y6Stk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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