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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2afd5dde20f0a96edbb2ad7da39480a7c3abbdb779767b7c23aa36b47c4e5c0' 
  AND token = '1jlDyQaiyNadbRwN1M7NdcvuFdne5vAg3gmxfZJdHUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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