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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d4997b634dfb72666c20a556906b988faa87b6aaf56e2be1c49c32b7d5f80e' 
  AND token = 'EXmY5HCclxB1QFHOjDCIeY8nHRQCXm8my25Ss+zFOMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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