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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e8dd89bb54dd56f92189d121f9793fbf1fd89c771a8e6189de1deea1fa0dbb' 
  AND token = 'E+P7brsCeLWL08IxczNm5L/GtdCZ1fwLG0ZR48sF8s0=' 
  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"
    }
  }
}