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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3f1865e5bbfc6829fae24e022c9f377ee8138f22c809f0aa118767cbd6d4c3' 
  AND token = '2UnDvxQN3NROOCk7YTcwkS5x+Qp2wJmJAVEO6CcifWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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