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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728901e26da448366f6a74a7033f2227a156838ba9089c9f9486998808f9e177' 
  AND token = '+beJDxa9JBi3EJJBwEK1GPJ8sXLcA3i0TPk+AisHUz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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