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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b19c2cde431dfee56523c0d68f1eec093d5c5759c09d9c085f95fa2b812415d' 
  AND token = 'SZKTbIn7yOQAWRXi3WTr+9/c1qKYZDKY+4KsihFIMQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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