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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d1e0b0d6783ad6cd59e68785fe2dd1b8572441c5c8b8ac721bb46e7ebaa761' 
  AND token = 'TGp/xlo4bptyb5Q4hFzR3sZSbYEvqu16eFkLvRg8PEQ=' 
  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"
    }
  }
}