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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eeeb6166da3013b4e96fa0d7ce045b37324ab4a6fd1d998086b5c5e43ceb5e4' 
  AND token = 'mo2N2eM4KoNY980CtMzLqZ21Ed8hkFfJ3LuS9o/elsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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