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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa74b10fe2df3df6013c4151ea3ffb916c919d769dbb51c2782f7000a82c7141' 
  AND token = 'sf+PB4/xrAIXQ7GzUWD4+rrHhPsxUOkm0COr7ufofWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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