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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01398dd8e7988e9f3dba8888b1b1e339f170537e849645d70ad87d764c8e3df9' 
  AND token = 'HgPP4A7aSjTrKzZQ1XCdwXfGn4ugiFj/ZKcArm2xF94=' 
  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"
    }
  }
}