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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bf12ea3390e323875f77720c3fba2cafbb683b827e7ce424fd39e8bf56a110' 
  AND token = 'PH1O8l7/QvMz07lxQQAt4YB5J1U8e6kZrw9/Iqa67eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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