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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62752567fa30898393d275931b15d15196c3dfd09b949ef1f1b3aca54dbecea' 
  AND token = 'MnVK9r90KphLxXu8i4mxqg+HfTO8wSMqnmwIl9Q4pDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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