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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a0d8b4aa2e484b5175981637daef243a26b30aaeb7c6a314ed1da67c76e9bc' 
  AND token = 'BasSrnx0uZeFt3eKfFAbP/jOurM8lRJ0kZFoXQbxymU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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