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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253430c3ba98720871beb6699a4c38e5d1832ce4961d2371ab0e9be748d6c0bc' 
  AND token = '1R6DmO5ySAuyWwN2iC6FVizps3K8KCIIOFTH02zQjPc=' 
  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"
    }
  }
}