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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ddf8e8c3189d6c07a2e30a1346def3a09490dde4d0db2ecf083f8c61dad4d6' 
  AND token = 'h3hWLWLP+gQg7qyl7mWPC2A38HpzG2S8DUnYPkhQAus=' 
  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"
    }
  }
}