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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54a3022674a15336b3c7e6b3a7a345c258ab8381c8b1e5554e7d29011fad4b2' 
  AND token = 'jb62XYNVrJhhdPqyIFeV3wJrJg+mk2H3ts6w+Vcxa1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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