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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8021712f1b81c84f30bcb123b16905508ded13b6dca294f2c5622f764819d5' 
  AND token = 'c5ty2oMh8YL8c1JZyuVIqy/NMxf73duZsfXfqH2/p6c=' 
  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"
    }
  }
}