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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edba99dba01dbca908f7fdb1bbf063e33a2f99c422b76051bc54c2e87284df38' 
  AND token = 'a2WOzPOvOCNO0ZITpHTa3WR/fMLQ+8XpYXA5w6ORHn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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