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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4019539bb725a3ccab19c2b9aadf426b2c6202cd2eb3f60c6548cf80f5df489' 
  AND token = 'u1wt5K9S1rhHpSB149k3qk7FN8+uiy/eGtRkLn8r0xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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