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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0430cf0b1a7ed937c08793d2a57dcbbf34288940801c7735088e1990b7d74f' 
  AND token = 'rvwvFQ4ccF/kGKugwOuHLD/92F2kW4iUj3j/2CX33to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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