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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e784e1260058cfd720cf8ba55c5bfbec3d779e29934b00e32be0a4e7fd0e1994' 
  AND token = 'mr4RFy8WZs2UkwMwn4s137/KJMMmnQFVT/blZiilW4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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