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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2882dc3e9a02d1d13133139a940cd91b7e4d0032383615ddab95707059ad6c' 
  AND token = 'SGIhI98qghYC7PzGuHwPLvtiTMImYir4H9bpWbcY5eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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