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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b02dd0b44e184a7a8c7e0a1fae772bc51dfdbe278988a1f6685a41a1deb2d0' 
  AND token = '9FOpS3FDUkB+0GobZ42S2TZGOHwQGyZD0/zzR9/kGxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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